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Insects Betray Themselves in Nature to Predators by Rapid Isomerization of Green Leaf Volatiles
Silke Allmann1,2, and
Ian T. Baldwin1,*
Abstract:
Plants emit green leaf volatiles (GLVs) in response to herbivoredamage, thereby attracting predators of the herbivores as partof an indirect defense. The GLV component of this indirect defensewas thought to be a general wound signal lacking herbivore-specificinformation. We found that Manduca sexta–infested Nicotianaattenuata attract the generalist hemipteran predator Geocorisspp. as the result of an herbivore-induced decrease in the (Z)/(E)ratio of released GLVs, and that these changes in the volatilebouquet triple the foraging efficiency of predators in nature.These (E)-isomers are produced from plant-derived (Z)-isomersbut are converted by a heat-labile constituent of herbivoreoral secretions. Hence, attacking herbivores initiate the releaseof an indirect defense a full day before the attacked plantsmanufacture their own defensive compounds.
1 Department of Molecular Ecology, Max Planck Institute for Chemical Ecology, Hans-Knöll-Str. 8, DE-07745 Jena, Germany. 2 Department of Plant Physiology, Swammerdam Institute for Life Sciences, Science Park 904, 1098 XH Amsterdam, Netherlands.
* To whom correspondence should be addressed. E-mail: baldwin{at}ice.mpg.de
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